By adapting the concept of epitaxy to two-dimensional space, we show growth a single-atomic-layer, in-plane heterostructure prototypical material system--graphene and hexagonal boron nitride (h-BN). Monolayer crystalline h-BN grew from fresh edges monolayer graphene with atomic lattice coherence, forming an abrupt one-dimensional interface, or boundary. More important, orientation is solely determined by graphene, forgoing configurations favored supporting copper substrate.

The magnetic domains in two-dimensional layered material $\mathrm{F}{\mathrm{e}}_{3}\mathrm{GeT}{\mathrm{e}}_{2}$ are studied by using a variable-temperature scanning tunneling microscope with tip after situ cleaving of single crystals. A stripy domain structure is revealed zero-field-cooled sample below the ferromagnetic transition temperature 205 K, which replaced separate double-walled and bubble when cooling under field Ni tip. can further convert to pattern as well move Neel-type chiral...

We investigated Pt-induced nanowires on the Si(110) surface using scanning tunneling microscopy (STM) and angle-resolved photoemission. High resolution STM images show a well-ordered nanowire array of 1.6 nm width 2.7 separation. Angle-resolved photoemission reveals fully occupied one-dimensional (1D) bands with Rashba-type split dispersion. Local $dI/dV$ spectra further indicate well-confined 1D electron channels nanowires, whose density states characteristics are consistent band splitting....

The spatially resolved thermoelectric power is studied on epitaxial graphene SiC with direct correspondence to atomic structures by a scanning tunneling microscopy (STM) method. A thermovoltage arises from temperature gradient between the STM tip and sample, variations of are distinguished at defects boundaries resolution. has high 42 μV/K big change (9.6 μV/K) monolayer-bilayer boundary. Long-wavelength oscillations revealed in thermopower maps which correspond Friedel electronic density...

Friedel oscillation refers to the quantum interference phenomena where electrons in a solid form standing waves on solid's surface as result of scattering by defects. A combined theoretical and experimental work shows that can open an energy gap graphene.

Point defects dictate various physical, chemical, and optoelectronic properties of two-dimensional (2D) materials, therefore, a rudimentary understanding the formation spatial distribution point is key to advancement in 2D material-based nanotechnology. In this work, we performed demonstration directly probe 2H-MoTe2 monolayers that are tactically exposed (i) 200 °C-vacuum-annealing (ii) 532 nm-laser-illumination; accordingly, utilize deep learning algorithm classify quantify generated...

Au-induced atomic wires on the Ge(001) surface were recently claimed to be an ideal 1D metal and their tunneling spectra analyzed as manifestation of a Tomonaga-Luttinger liquid (TLL) state. We reinvestigate this system for atomically well-ordered areas with high resolution scanning microscopy spectroscopy (STS). The local density-of-states maps do not provide any evidence metallic electron channel along wires. Moreover, resolved near Fermi energy are dominated by features, deviating...

The confinement effect of intercalated atoms in van der Waals heterostructures can lead to interesting interactions between the confined or molecules and overlaying two-dimensional (2D) materials. Here we report formation ordered Cu(100) $p(2\ifmmode\times\else\texttimes\fi{}2)$ oxygen superstructures by intercalation under monolayer hexagonal boron nitride $(h$-BN) on Cu after annealing. By using scanning tunneling microscopy x-ray photoelectron spectroscopy, identify superstructure reveal...

The competition, coexistence and cooperation of various orders in low-dimensional materials like spin, charge, topological charge-density-wave has been one the most intriguing issues condensed matter physics. In particular, layered transition metal dichalcogenides provide an ideal platform for studying such interplay with a notable case 1${T}$-TaS$_{2}$ featuring Mott-insulating ground state, charge-density-wave, spin frustration emerging superconductivity together. We investigated local...

Quasi-one-dimensional (1D) graphene nanoribbons (GNRs) have finite band gaps and active edge states therefore can be useful for advanced chemical electronic devices. Here, we present the formation of GNR grids via seed-assisted vapor deposition on Ge(100) substrates. Nucleation seeds, provided by unzipped C60, initiated growth GNRs. The GNRs grew toward two orthogonal directions in an anisotropic manner, templated single crystalline substrate, thereby forming that had lateral stitching over...

The Seebeck effect explains the generation of electric voltage as a result temperature gradient. Its efficiency, defined ratio generated to difference, is sensitive local inhomogeneities that alter scattering rate and density conduction electrons. Spin-polarized tunneling generates distinct thermovoltage in spin-up spin-down charge transport channels, which, key spin caloritronics, focuses on phenomena related heat. Here, we report spatially resolved measurement spin-dependent junction...

Superconducting properties of SrFe1.85Co0.15As2 single crystals and their parent material, SrFe2As2, were investigated by scanning tunneling microscopy spectroscopy (STM/S). In the we modeled surface conditions on in situ cleaved crystals, based observation 2×1 stripe patterns square-lattice atomic-resolution topography images with help local density states measurements. STM/S studies SrFe1.85Co0.15As2, a robust superconducting gap (2Δlarge=17.3 meV) was observed conductance spectra measured...

We present an image postprocessing framework for Scanning Tunneling Microscope (STM) to reduce the strong spurious oscillations and scan line noise at fast rates preserve features, allowing order of magnitude increase in rate without upgrading hardware. The proposed method consists two steps large scale images four atomic images. For images, we first apply each registration align forward backward scans same line. In second step a "rubber band" model which is solved by novel Constrained...

Fullerene fragments function as highly active and selective carbon catalysts for C–H bond activation.

Using a scanning microwave microscope (SMM), we have investigated the phase separation in 30%La5∕8Sr3∕8MnO3(LSMO)+70%LuMnO3(LMO) polycrystalline pressed powder sample, which LSMO is perovskite ferromagnetic metal while LMO hexagonal ferroelectric insulator. When electrical properties of sample were imaged using our SMM, showed significant contrast between metallic and insulating grains, indicating clear two phases. The identified by SMM clearly signal when magnetic force (MFM), providing...

We report an algorithm to identify and correct distorted wavefronts in atomic resolution scanning tunneling microscope images. This can be used nonlinear in-plane distortions without prior knowledge of the physical parameters, characteristics piezoelectric actuator, or individual atom positions. The 2D image is first defined as a sum sinusoidal plane waves, where distortion renders curve for otherwise ideal linear wavefront. Using Fourier transforms local areas image, generates wavefront...

We manipulated the stacking configuration of a few-layer MoS2 to investigate impact interlayer coupling on electrical band engineering. By simultaneously synthesizing two distinct types islands, wedding cake (W) and spiral (S), same substrate, we explored layer-dependent properties under identical experimental conditions. used multiple scanning probe microscopy techniques map local electronic with respect number layers, configurations, heterogeneities. First-principles calculations verified...

We investigate the structural and electrical properties of Cu film reveal their changes as a function post-annealing temperature. Thermal annealing on dielectric substrate can improve its crystallinity; however, high-temperature also leads to morphological transformation that hinders precise measurement properties. The enhanced crystallinity films is verified with x-ray diffraction temperature increases. To examine after dewetting processes, which promotes formation voids agglomerations, we...